Flask for manufacturing artificial dentures



June 14, 1932. R. M MILLER 1,862,699

FLASK FOR MANUFACTURING ARTIFICIAL DENTURES Filed Dec. 30. 1929 A TTORNE Y.

Patented June I4, 1932 UNITED STATES ROLAND M. MILLER, OF CLEVELAND, OHIG FLASK FOR MANUFACTURING ARTIFICIAL DENTURES Application filed December 30, 1929. Serial No. 417,273.

rIhe invention relates to improvements in the method of a means for constructing artificial dentures.

And the particular objects are to provide a flask which is so constructed that the material from which the denture is made can not overflow the metal outer walls of the flask at the parting line or congeal thereon and hence can not by the interposition of material between the separable parts of the flask at the parting line, alter the vertical positions of the incisive edges of the teeth relative to the respective upper and lower ridges of the mouth, since unless this dimension agrees with that of the mouth of the patient, the teeth can notdproperly meet or be used to masticate foo To accomplish this and other valuable objects, the invention includes the provision of an external overflow chamber and the arrangement of parts and construction of de tails, hereinafter more ful-ly described, illustrated in the accompanying drawing and particularly pointed out in the claims.

In the accompanyingdrawing Fig. l, is a plan of the flask employed in constructing the artificial dentures; Fig. 2, is a vertical section thereof showing the first step of the process in which the place of the artificial denture is filled by a wax pattern; Fig. 3, is a vertical section taken at right angles to Fig. 2, showing the artificial denture compressed of bake lite or analogous material in place and illus* trating the use of a marginal overflow chamber that receives the waste overflowing from the mold when it is placed under pressure.

In these views A is the upper portion of the flask and B is the lower portion thereof and C is a detachable lid for the upper portion. D is the inner wall of the flask which acts as the retaining and reinforcing means for the plaster P, in which the mold for the artificial denture is formed. E, E, are registering annular outer channels enclosing th-e flask parts, and forming an overflow chamber between them.

'I'he outer walls F, F, of these channels are raised higher than the inner walls D, D, and the meeting edges Gr, Gr, for the mold parts 50 are formed upon these outer walls and a space II, is left between the edges of the inner walls which will be filled with plaster P thus preventing the material from contacting with the metal edges.

For this reason when the mold parts are pressed together' any surplus of material will flow through the space I-I'into the chamber as shown in Fig. 3 and will not enter between the meeting edges of the metallic outer wall at the parting line, and can not prevent the mold parts from closing. This improvement is necessary since if the plaster material should engage with the metal wall at the parting line it would immediately congeal upon the metal edges and would separate these parts.

As shown in Fig. 3 the desired distance to be maintained between the incisive edges of the teeth I and the ridge of the mouth is illustrated in the upper aw by the dotted lines at J, Fig. 3, and since no material can flow between the outer flask walls at the parting line G, this distance will not vary in the hands of a careless operator.

It will be understood that the -improved form of flask is particularly adapted for use with such material as bakelite which is tough er and more. difficult to press into the mold than vulcanite heretofore employed for its purpose, and hence a greater amount of pressure is required to lill out the mold properly.

Also this material will solidify quickly if it touches hot metal and hence can not be permitted to touch the metal walls of the flask.

In Fig. 2 Wis the wax denture, and in Fig. 3 Z is the bakelite denture forced into the space left when the wax has been removed by steam or hot water.

To overcome these difficulties the mold porl tions are spaced apart at II, which space will be filled with the plaster of the matrix M and any overflow of the material will flow over the plaster and will be received into the overflow chamber formed by the channel E without danger of its entering the parting line between the meeting edges of the metal walls.

The teeth are embedded in the upper plaster matrix P and are able to endure without breaking the pressure required to ll the mold when there is no additional pressure made upon them to force the overflowed material between the metal margins at the parting line.

Having described the invention what I claim as new and desire to secure by Letters Patent is:

l. Im a. flask for the manufacture of an artificial denture, upper and lower metal flask portions and a cover for the upper portion, said portions being provided with integral spaced outer and inner concentric side walls forming registering channels therein and providing an external overflow chamber thereabout, the edges of the outer walls being in contact with each other to form the parting line of said flask, the edges of said inner walls being vertically separated to provide a lateral opening through which the matrix material will pass, to line the walls of said opening and prevent contact of the denture A material therewith.

2. In a flask for an artificial denture, upper and lower metal portions enclosing a marginal overflow chamber between them the meeting edges of the outer walls of said chamber contacting to form the parting line be tween said flask portions, the edges of the inner walls being vertically spaced apart, a plaster matrix and dentition formed in said upper flask, and a complementary plaster matrix in the lower portion of said flask said plaster matrices filling the. space between said spaced inner wall edges, and preventing the overflow of denture material from said matrices from contacting with the metal walls of said opening.

3. In a flask for an artificial denture upper and lower metal flask portions, matrices of non-metallic material therein an external annular overflow chamber between said flask portions, the edges of the external walls of said chamber forming the parting line for said flask portions, the edges of the inner walls being spaced apart, to permit overlapping of matrix material therebetween.

In testimony whereof I afliX my signature.

ROLAND M. MILLER. 

